Imaging lens and imaging apparatus

Abstract

An imaging lens consists of a first lens group, a second lens group, an aperture stop and a third lens group that has positive refractive power in this order from an object side. The first lens group consists of an L11 lens having positive refractive power, an L12 lens having negative refractive power, an L13 meniscus lens having negative refractive power with its concave surface facing an image side, an L14 lens having negative refractive power with its concave surface facing the object side and two or three lenses, each having positive refractive power, in this order from the object side. The second lens group consists of an L2p lens having positive refractive power and an L2n lens having negative refractive power.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of PCT International Application No. PCT / JP2013 / 003926 filed on Jun. 24, 2013, which claims priority under 35 U.S.C. §119(a) to Japanese Patent Application No. 2012-151319 filed on Jul. 5, 2012. Each of the above applications are hereby expressly incorporated by reference, in its entirety, into the present application.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a retrofocus-type imaging lens and an imaging apparatus. In particular, the present invention relates to an imaging lens used in electronic cameras, such as a digital camera, a camera for broadcasting, a camera for surveillance and a camera for film making, and an imaging apparatus including the imaging lens.[0004]2. Description of the Related Art[0005]As an imaging lens used in an imaging apparatus, such as a video camera and an electronic still camera, which uses an imaging device, such as a C...

AI Technical Summary

Benefits of technology

The present invention provides a fast imaging lens with excellent correction of various aberrations and a short total length. The lens consists of a first lens group, a second lens group, a stop, and a third lens group. The first lens group includes an L11 lens, an L12 lens, an L13 meniscus lens, and two or three lenses with positive refractive power. The second lens group includes an L2p lens and an L2n lens. The imaging lens is designed to correct various aberrations and provide high-quality video images. The imaging apparatus using this lens is also smaller in size.

Problems solved by technology

However, all of the lenses proposed in Patent Documents 1 through 3 have drawbacks that F-numbers are about 2.8 through 3.6, which means slow lenses.

Images